package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.config.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;


import java.net.URLEncoder;
import java.util.HashMap;

@Controller
@CrossOrigin
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;
    //获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code,String state){
        try {
            //1.获取code值，临时票据
            //2.拿着code请求 微信的固定地址得到两个值access_token和openId
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数id 密钥 和code值
            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            //从aceessToken字符串中获取出来两个值access_token和openid
            //将字符串转换为map集合使用gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            System.out.println(access_token);
            String openid = (String) mapAccessToken.get("openid");
            System.out.println(openid);

            //判断表中是否存在相同的微信信息，根据openid判断
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member==null){
                //拿到access_token和openid再去请求微信提供的固定地址，获取扫描人的信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, access_token, openid);
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userInfo字符串扫描人的信息
                HashMap userInfoMap = gson.fromJson(userInfo,HashMap.class);
                String nickname = (String) userInfoMap.get("nickname");
                String headimgurl = (String) userInfoMap.get("headimgurl");

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToekn = JwtUtils.getJwtToken(member.getId(),member.getNickname());
            return "redirect:http://localhost:3000?token="+jwtToekn;
        } catch (Exception e) {
            throw  new GuliException(20001,"登录失败");
        }

    }

    //1.生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode() {
        //固定地址，后面拼接参数
//        String url = "https://open.weixin.qq.com/" +
//                "connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";

        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch(Exception e) {
        }

        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );

        //重定向到请求微信地址里面
        return "redirect:"+url;
    }
}
